Time-dependent forces between a swift electron and a small nanoparticle within the dipole approximation
| Autor: | Carlos Maciel-Escudero, Rubén G. Barrera, J. Castrejón-Figueroa, Alejandro Reyes-Coronado, J. Á. Castellanos-Reyes |
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| Přispěvatelé: | Universidad Nacional Autónoma de México, Consejo Nacional de Ciencia y Tecnología (México) |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Classical Physics (physics.class-ph) FOS: Physical sciences Physics::Optics Nanoparticle Physics - Classical Physics 02 engineering and technology Electron Discrete dipole approximation 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation Molecular physics Dipole 0103 physical sciences Classical electromagnetism Impact parameter 010306 general physics 0210 nano-technology Multipole expansion |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.155413 |
| Popis: | In this paper we calculate the time-dependent forces between a swift electron traveling at constant velocity and a metallic nanoparticle made of either aluminum or gold. We consider that the nanoparticle responds as an electric point dipole and we use classical electrodynamics to calculate the force on both the nanoparticle and the electron. The values for the velocity of the electron and the radius of the nanoparticle were chosen in accordance with electron microscopy observations, and the impact parameter was selected to fulfill the constraints imposed by the dipole approximation. We find that there are times when the force on the nanoparticle is attractive and others when it is repulsive, and show that this is due to the delayed electromagnetic response of the nanoparticle. To establish the limits of validity of our approach, we calculate the total linear momentum transfer to the nanoparticle, and compare it with results obtained, in frequency space, using the full multipole expansion of the fields induced on the nanoparticle, considering the effects of electromagnetic radiation. This work was supported by UNAM-PAPIIT project DGAPA IN114919. J.C.-F and J.Á.C.-R. are doctoral students from Programa de Doctorado en Ciencias Físicas, Universidad Nacional Autónoma de México (UNAM), and received scholarships 477516 and 481497, respectively, from Consejo Nacional de Ciencia y Tecnología (CONACyT), Mexico. C.M.-E. was a master student from Programa de Maestría en Ciencias Físicas, Universidad Nacional Autónoma de México (UNAM), and received scholarship 420478, from Consejo Nacional de Ciencia y Tecnología (CONACyT), Mexico. |
| Databáze: | OpenAIRE |
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